Cartridge fuse extractor



June 11, 1935. J. .1. DANTE 2,004,314

CARTRIDGE FUSE EXTRACTOR Filed Oct. 29, 1931 INVENTOR Joseph J.D ante.

BY H15 ATTORNEY Patented June 11, 1935 UNITED s AT s CARTRIDGE FUSE EXTRACTOR Joseph John Dante, Bantam, Conn., assignor to The Palmer Electric & Manufacturing 00.,

Waltham, chusetts Mass, a corporation of Massa- Application October 29, 1931, Serial No. 571,705

6 Claims.

This invention relates to cartridge fuses, and more particularly to a fuse holder having a manually operated bell-crank lever for extractv ing such a fuse with the minimum of effort with- 5 out the use of fuse pullers, tongs, or other tools.

A further object of this invention is to provide a fuse extractor of the above nature in which the danger involved in removing the fuse will be greatly diminished.

A further object is to provide a device of the above nature which will be simple in construction, inexpensive to manufacture, easy to install and manipulate, compact, ornamental in appearl ance, and very efficient and durable in use.

With these and other objects in view there have been illustrated on the accompanying drawing, two forms in which the invention may be 1 conveniently embodied in practice.

In the drawing:

Fig. 1 represents a front elevation of a fuse block having a pair of cartridge fuse clips mounted thereon, one of said clips being provided with an insulated extractor lever pivoted thereto.

Fig. 2 is an end view of the same.

Fig. 3 is a detail perspective view in separated relationship of the extractor lever and its associated fuse clip.

Fig. 4 is an end view on an enlarged scale of a modified form of the invention showing a spring for returning the extractor lever to its normal position.

It is well known to electricians that it usually requires a pull of from ten to twenty pounds to remove a fuse of the cartridge type from its 5 socket clips, and in order to exert such a force it is necessary for the operator to insert his fingers under the fuse for practically its entire length with the consequent danger of injury from contact with the fuse clips.

By means of the present invention, the above and other disadvantages have been avoided. This has been accomplished by providing an insulating extracting lever attached to the fuse block which permits the operator to release one end of the fuse from its clip without touching the fuse or clips in any way. The fuse may then be readily grasped andseparated from the other fuse clip without danger of shock.

Referring now to the drawing in which like reference numerals denote corresponding parts throughout the several views, the numeral ID indicates an insulating base block having a pair ofalined U-shaped socket clips H and I2 of the conventional type. The socket clips II and I2 are adapted to be seated in a pair of depressions l3 and I4 formed in the top face of the base block I and are secured in position as by a pair of screws l and I6. The socket clips H and 12 are connected to a pair of terminal posts IT and I8, respectively, by means of a pair of fiat metal conductor strips Ila and l8a, so that these posts are adapted to be electrically connected by the insertion of asuitable cartridge fuse IS in the clips H and I2. The fuse I9 is provided with the customary form of cup-shaped cylindrical metallic end caps and 2| which are adapted to be detachably snapped into the socket clips H and [2.

In order to facilitate the removal of a defective or blown-out fuse whenever desired, provision is made of a bell-crank extractor lever 22 pivotally mounted upon a rivet 23 having its ends seated in the opposite upstanding legs 24 and 25 of the clip I2. The rivet 23 is held securely in position by means of exterior heads 26 and 21 engaging the outer surfaces of the legs of the U-shaped clip I2. The extractor lever 22 is preferably made of strong insulating material, such as molded phenolic condensation product, pressed fibre or steel covered with an insulating material, and comprises a relatively long fiat recessed handle 28 and an integral relatively short inwardly extending cam member 29. The extremity of the cam member 29 is provided with a raised rounded surface or nose 30 which is adapted to engage the under side of the metallic cap 2| for separating said cap from the fuse clip 12 when the handle 28 is manually operated. The cam member 29 is provided with an intermediate transverse hole 31 adapted to be journaled on the rivet 23.

As will be understood, when the fuse I9 is assembled within the socket clips II and [2 in the position shown in Fig. 1, the handle 28 will project upwardly beyond the end of said fuse I9 in a position easily accessible to the operators hand.

Operation In operation, when it is desired to remove a fuse, it will only be necessary for the operator to grasp or press against the upper end of the handle 28 and swing it in a clockwise direction as indicated by the arrow in Fig. 1 to the position indicated by the dot and dash lines. The nose 30 of the cam member 29 will thus be caused to force the end cap 2| of the fuse out of its socket clip l2 to the dotted line position shown in Fig. 1. The operator may then grasp the body of the cartridge fuse l9 and detach the other end cap 20 from its clip II.

The modified form of the invention shown in Fig. 4 is similar in most respects to the first form While there have been disclosed in this specification two forms in which the invention may be embodied, it is to be understood that these forms are shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosures but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what I claim as new, and for which itis desired, to secure Letters Patent, is: i v '1. A holder for a conventional cartridge fuse, comprising a pair of spaced clips adapted to receive and clamp respective end caps of v a fuse, each said clip consisting of a strip ofresilient metal bent to an approximate U-shape, the arms of the U having their upper portions outwardly bowed to receive and fit against a cylindrical end cap of a fuse, and an ejecting member mounted on the lower portions of the arms of one of said clips to rock on an axis directly under the fuse cap mounted in said clip.

2. A device of the class described, comprising a clip adapted to receive and clamp an end cap of a conventional cartridge fuse, said clip consisting of a strip of resilient metal bent to approximate U- shape, the arms of said U having upper'portions outwardly bowed to receive and fit against a cylindrical end cap, and an L-shapd lever rockably mounted on the lower portions of said arms on an one of said clips.

4. In 'a' cartridge fuse holder and ejector, the combination with a clip having side portions gripping the sides of a cartridge, and a U-shaped member jcurnaled intermediate said side portions 'below the cartridge, of a lever for rotating said member to cause it to displacethe cartridge from itshold in the clip. .7 ..'..:t

5. A cartridge fuse holder and ejector'comprising a clip having opposite spring portions for gripping a cartridge, a crank supported by and pivoted in said clip portions below said cartridge, and operating means for rotating said crankto cause it to displace the cartridge outwardly. from said clip. v 5.:

v 6. A cartridge fuse holder and ejector comprising a spring clip having opposite arcuate portions for gripping the sides of a cylindrical cartridge, a crank supported by and pivoted in said clip portions below said cartridge and adapted when rotated to displace said cartridge a distance sufi'icient to'cause its axis to travellbeyond the plane of the outer ends of said arcuate portions, and operating means for rotatingsaid crank;

' JOSEPH;JOHN DANTE; 

